Introduction
The Bently Nevada 330707-00-25-90-12-00 is a 3300 XL 11 mm Proximity Probe configured for applications that require a relatively long cable run between the sensing point and associated monitoring electronics. The documented configuration identifies it as an 11 mm probe with a 5/8-18 UNF thread, 2.5-inch case length, 9.0 m integral cable, miniature coaxial ClickLoc connector, and standard cable.
The 330707 configuration is the unarmored version of the 3300 XL 11 mm probe family. Its 90 cable option provides a substantial 9 m connection length, making this version particularly useful when the Proximitor Sensor cannot be installed close to the machinery measurement location.
With its non-contact eddy-current sensing principle, the probe is intended for continuous measurement of shaft vibration, radial position, axial position, and related machinery parameters. The 11 mm sensing platform is also suited to applications where a greater linear range is desirable compared with conventional 8 mm proximity probes.
Technical Specifications
| Parameter | Specification |
|---|
| Manufacturer | Bently Nevada |
| Part Number | 330707-00-25-90-12-00 |
| Product Family | 3300 XL |
| Product Type | 11 mm Proximity Probe |
| Probe Model | 330707 |
| Sensing Diameter | 11 mm |
| Mounting Thread | 5/8-18 UNF |
| Construction | Unarmored |
| Unthreaded Length | 0 in |
| Overall Case Length | 2.5 in (63.5 mm) |
| Integral Cable Length | 9.0 m (29.5 ft) |
| Connector | Miniature coaxial ClickLoc |
| Cable Type | Standard cable |
| Connector Configuration | ClickLoc without connector protector |
| Agency Approval | 00 – Not required |
| Measurement Principle | Eddy-current, non-contact |
| Nominal Linear Range | Approximately 4 mm (160 mils) |
| Nominal Scale Factor | Approximately 3.94 V/mm (100 mV/mil) |
| Typical Measurements | Shaft vibration, radial position, axial position |
| Typical Applications | Turbines, compressors, motors, generators |
| Probe Weight | Lightweight sensor assembly |
| Shipping Weight | Approximately 1.5 kg |
| Cable Length in Feet | Approximately 29.5 ft |
Applications
Steam and Gas Turbines
The 3300 XL 11 mm system can be integrated into turbine monitoring arrangements for continuous shaft vibration and displacement measurement.
Compressor Monitoring
The probe can be used on compatible compressors to observe shaft movement and provide input to machinery protection and condition-monitoring systems.
Motor and Generator Monitoring
For large rotating electrical machines, non-contact proximity measurement provides a practical method of monitoring shaft movement without physical contact with the rotating surface.
Radial Shaft Vibration
The probe can be installed at suitable radial measurement points to detect changes in shaft position and vibration.
Axial Position Measurement
The 11 mm sensing platform can be used in appropriate axial-position installations where the machine geometry and target material are compatible with the measurement system.
Remote Proximitor Installation
The 9 m integral cable is the defining practical advantage of this configuration. It allows the associated Proximitor Sensor to be positioned farther from the actual measurement location than a 1 m configuration permits.
Machinery Protection
When integrated with compatible 3300 XL Proximitor and monitoring equipment, the probe can provide continuous displacement information for alarm, trending, and protective functions.
Existing Imperial-Thread Installations
The 5/8-18 UNF thread makes this model particularly relevant to machinery and mounting arrangements designed around imperial dimensions.
Advantages
9 m Integral Cable
The 9.0 m cable is the standout feature of this model. It provides additional installation flexibility when the monitoring electronics cannot be located immediately beside the machine.
11 mm Sensing Technology
The 11 mm sensing platform provides approximately 4 mm of nominal linear range, making it well suited to demanding displacement and shaft-position measurements.
2.5-inch Compact Case
Despite its long cable, the actual probe body remains relatively compact at 2.5 inches, or approximately 63.5 mm.
5/8-18 UNF Mounting
The imperial mounting thread makes the probe a natural fit for machinery designed around 5/8-18 UNF mounting hardware.
Non-Contact Measurement
Eddy-current technology allows the probe to monitor shaft movement without contacting the rotating component. This avoids mechanical wear at the sensing interface.
Standard ClickLoc Connector
The 12 connector configuration uses a miniature coaxial ClickLoc connector with standard cable, providing a practical connection to compatible 3300 XL electronics.
Unarmored Construction
The unarmored construction keeps the probe assembly straightforward and can be suitable for installations where additional cable armor is not required.
Flexible Machinery Monitoring
The probe can support vibration, radial-position, axial-position, and other compatible displacement measurements, making it a versatile component in rotating-equipment monitoring systems.
Replacement-Friendly Configuration
For an existing 330707 installation, matching the 2.5-inch case, 9 m cable, 12 connector option, and 00 approval option can significantly simplify replacement planning.
Technical FAQs
1. What is the Bently Nevada 330707-00-25-90-12-00?
It is a 3300 XL 11 mm Proximity Probe with a 2.5-inch case, 9 m cable, 5/8-18 UNF thread, miniature ClickLoc connector, standard cable, and no required agency approval.
2. Is the 330707 an armored probe?
No. The 330707 configuration is the unarmored 3300 XL 11 mm probe. This differentiates it from armored configurations in the 330704 and related families.
3. What does the 25 option mean?
The 25 option identifies the 2.5-inch overall case length, equivalent to approximately 63.5 mm.
4. What does the 90 option specify?
The 90 option specifies a 9.0 m (29.5 ft) total cable length.
5. What connector does the probe use?
The 12 option specifies a miniature coaxial ClickLoc connector with standard cable.
6. Does the 12 configuration include a connector protector?
No. The connector-protector version is identified by a different configuration option. The 12 option is the standard miniature coaxial ClickLoc arrangement.
7. What mounting thread does this probe use?
The 330707 uses a 5/8-18 UNF thread, making it an imperial mounting configuration.
8. What is the nominal measurement range?
The 3300 XL 11 mm system provides a nominal 4 mm (160 mils) linear range, with an approximate scale factor of 3.94 V/mm (100 mV/mil).
9. What is the approximate shipping weight?
The listed shipping weight is approximately 1.5 kg. Actual shipment weight can vary according to packaging and order configuration.
10. Can it replace a 330704 probe?
Not as a direct mechanical replacement. The 330707 uses a 5/8-18 UNF thread and unarmored construction, whereas the 330704 family uses a different mounting arrangement. The case length, cable length, connector configuration, and installation geometry must all be checked before substitution.
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